Crossword Genius

Military officer, say (7)

Ross

I believe the answer is:

martial

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'military' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for martial that I've seen before include "Soldierly (arts?)" , "Specialist in epigrams" , "relating to soldiers" , "Relating to the armed forces" , "Relating to hostilities" .)

I've seen this clue in The Independent.
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